Bushing-terminal connecter



C. F. BURGESON Oct. 11, 1927. 1,645,090

BUSHING TERMINAL CONNECTER 'Filed Oct. 2, 192 s Inventor i His Attorney.

Charles F: Burieson,

' Patented oer. .11, 1927.

'1 UNITED STATES PATENT OFFICE.

('ZHARLES I. BURGESON, OF MINNEAPOLIS, MINNESOTA, ASSIGNOR TO GENERALELEC- TRIO COMPANY, LA CORPORATION OF NEW YORK.

BUSHING-TERMINAL CONNEGTER.

Application filed October 2, 1926. Serial No. 139,052;

My invention relates to bushing terminal connecters. Electricalapparatus such as a transformer or a circuit breaker is often immersedin oil in a casing which is pro- I vided with suitable insulatingbushings for the leads which are brought out to terminals at the outerends of the bushings, the external lines being connected to theseterminals. The-bushings are usually assembled from parts which arelargely of fragile material such as porcelain and experlence has shownthat breakage of a bushmg or other injury thereto is likely to be causedby the pull and vibration of an external line conductor connected to itsterminal. This pull on the bushing may be in any one of various turnat'substantlally right angles to the axis directions, either directlyin'line with the axis of the bushing or in some lateral direction,depending upon the direction in which the conductor leaves the bushingterminal.

Sometimes a bushing terminal has been connected directly to a rigid andunyieldable external conductor such as a bus 'bar and'in this case theextent and direction of the pull in injury to the bushing if theapparatus settles unevenly and sovas to tip away from the direction ofthe conductor connected to the bushing.

The general object of the invention is to provide a bushing with ayieldable connecter '4oint erposed betweenv the bushing terminal and anexternal conductor-to relieve the bushing from excessive pull by theconductor. In its preferred" form the "connecter comprises 'a yieldable,resilient helical con- 'Iductor'; its resiliency serving to absorb vi- 1bration and shock which may occur in. the

"external conductor and its helical formserv-f .mg to. produce reactancemayprotect the apparatus" from electrical disturbances in "it e externalconducton.

Other objects and advantages? appear from the following descriptiontaken in connection with the accompanying drawing inwhi'ch Fig. 1 is abushing terminal conbushing 12.

Like reference characters refer tosimilar parts in thedifierent figuresof the draw- Tn its preferred form as shown in the drawing, theconnecter comprises a yieldable resilient helical conductor 10 formed ofa flat strip of conducting material wound edgewise with spaced turns,and with the greater cross sectional dimension of each of the helix; Thelower end of the connecter is connected to the terminal 11 of a bushing12 extending through a casing 13 such as is commonly used to enclose alarge transformer. -An external conductor 14 is connected to the upperor outer end of the connecter 10.. The external conductor 14 is shown inthe drawing as extending laterally from the connecter 10 so as to exerta lateral or sidewise pull on the connecter 10 and The flat crosssectional-form of the turns of the connecter 10 strengthens theconnecter against the lateral pull of the external conductor 14 but theconnecter will yield. in

v any direction to prevent the pull which is transmitted from theexternal conductor to the bushing from becoming excessive from any causesuch as tipping or settling of the casing 13 on its foundat1on. Thereactance of the connecter due to its helical form provides. protectionfor the transformer and bushing against electrical disturbances in theexternal conductor. 14. The connecter 10 is also preferably suflicientlyresilient to absorb vibration and shock from the external conductor 14and substantially re duce transmission of-such' mechanical disturbancesfrom the external conductor to the bushing. The connecter thus providesboth electrical, and .'mechanical protection for the bushing.

The connecter various changes may of course be made withm the scope ofthe inventlon as defined in the appended V has been described in what]is'now considered its preferred form but What I claim as new and desireto secure by Letters Patent of the United States is:

1. A bushing for encased electrical apparatus, said bushing having anouter terminal, an external conductor, and a yieldable connecterinterposed between said bushing terminal and said external conductor;said yieldable connecter being in the form of an inductive helix.

2. A'bushing for encased, electrical apparatus, said bushing having anouter terminal, an external conductor, and a yieldable connecter in theform of an inductive helix interposed between said bushing terminal andsaid external conductor, said connecter comprising a fiat conductor withits greater nal, an external conductor, and a yildable resilientconnecter interposed between said bushing terminal and said externalconductor, sal-d connecter comprlslng a flat resillent helical conductorwith its greater cross sectional dimension substantially at right anglesto the axis of the hellx.

In witness whereof, I have hereunto setmy hand this22nd day of September1926. CHARLES BURGESON cross sectlonal dimension substantially at

